Scraper conveyer

Abstract

The utility model relates to a scraper conveyer, it includes drive device, bracing device and scraper chain group, drive device includes motor and drive sprocket driven by said motor, bracing device includes bracing sprocket, tensioning device and broken chain protector, scraper chain group includes chain and is provided with the scraper on the chain, and the chain is connected with the chain. The chain is arranged around the driving chain wheel and the tight supporting chain wheel, the tensioning device is connected with the tight supporting chain wheel and can enable the tight supporting chain wheel to move in the extending direction of the chain, and the chain breakage protector is arranged on one side of the tight supporting chain wheel and used for detecting the rotating speed of the tight supporting chain wheel. According to the scraper conveyor, the tightness of the chain can be adjusted, chain breaking and chain disengaging faults are reduced, and the chain breaking and chain disengaging faults are detected in time.

Description

Technical Field

[0001] The utility model relates to the technical field of material transportation, in particular to a scraper conveyor. Background Art

[0002] As the market demand for deep sludge dehydration increases, not only more efficient sludge deep dehydration main units are needed, but also related supporting equipment that matches the sludge deep dehydration main units. Scraper conveyors are an integral part of the sludge deep dehydration system in sewage treatment plants. According to the requirements of the sludge deep treatment process, the dried sludge with a certain temperature needs to be conveyed in a closed manner, and large-angle or even vertical lifting and conveying are required. Therefore, a new type of continuous conveying machine that can efficiently convey bulk materials such as dust, small particles, and small blocks is needed. During the continuous conveying of materials, the scraper conveyor occasionally derails or breaks due to differences in the material's shape and loose equipment. If it is not shut down in time, it will cause greater damage to the equipment. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a scraper conveyor which can adjust the tightness of the chain, reduce chain breakage and chain separation failures, and detect chain breakage and chain separation failures in a timely manner.

[0004] To achieve the purpose of the utility model, the utility model provides a scraper conveyor, which includes a driving device, a tensioning device and a scraper chain group, the driving device includes a motor and a driving sprocket driven by the motor, the tensioning device includes a tensioning sprocket, a tensioning device and a chain break protector, the scraper chain group includes a chain and a scraper arranged on the chain, the chain is arranged around the driving sprocket and the tensioning sprocket, the tensioning device is connected to the tensioning sprocket and can make the tensioning sprocket move along the extension direction of the chain, and the chain break protector is arranged on one side of the tensioning sprocket and is used to detect the rotational speed of the tensioning sprocket.

[0005] In some embodiments of the present invention, the tightening device also includes a first shell, a guide rail, a support seat, a first bearing and a first rotating shaft. The guide rail is arranged on the first shell, the support seat can be movably arranged on the guide rail along the guide rail, the first bearing is arranged on the support seat, the tightening sprocket is circumferentially linked to the first rotating shaft, and the first rotating shaft is connected to the first bearing.

[0006] In some embodiments of the present invention, the tensioning device includes a screw and a rotating head provided at one end of the screw, and the rotating head is provided on the outside of the shell; the end of the screw is rotatably connected to the support seat and the screw is threadedly engaged with the shell, or the end of the screw is threadedly engaged with the support seat and the screw is rotatably connected to the first shell.

[0007] In some embodiments of the present invention, the chain break protector is connected to the support seat.

[0008] In some embodiments of the present invention, the tensioning device further includes a first observation window, which is provided on the first shell and faces the tensioning sprocket.

[0009] In some embodiments of the present invention, the driving device includes a second housing, a driving wheel, a driven wheel, a transmission chain, a second rotating shaft, a second bearing and a sealing assembly, the second bearing is arranged in the second housing, the second rotating shaft is connected to the second bearing, the driving sprocket is connected to the second rotating shaft and is located inside the housing, the driven wheel is connected to the second rotating shaft and is located outside the housing, and the sealing assembly is arranged between the housing and the second rotating shaft; the motor is located outside the housing and connected to the housing, the motor is connected to the driving wheel, and the transmission chain is arranged on the driving wheel and the driven wheel.

[0010] In some embodiments of the present invention, the motor is a variable frequency reducer.

[0011] In some embodiments of the present invention, the motor is located above the second housing.

[0012] In some embodiments of the present invention, the sealing assembly is disposed between the drive sprocket and the second bearing.

[0013] In some embodiments of the present invention, the driving device further includes a second observation window, and the second observation window faces the driving sprocket.

[0014] In some embodiments of the present invention, the chain includes, in its extension direction, a first horizontal section, a vertical section, and a second horizontal section connected in sequence between the drive sprocket and the tensioning sprocket, the second horizontal section is higher than the first horizontal section, and one of the first horizontal section and the second horizontal section is provided with a feed port and the other is provided with a discharge port.

[0015] In some embodiments of the present invention, the chain also includes a first turning section between the second horizontal section and the vertical section, and the scraper conveyor also includes a first redirecting wheel and a second redirecting wheel, the first redirecting wheel is arranged under the chain located above the first turning section, and the second redirecting wheel is arranged under the chain located below the first turning section; the scraper conveyor also includes a third observation window, and the third observation window faces the first turning section.

[0016] In some embodiments of the present invention, in the second turning section between the first horizontal section and the vertical section, the scraper conveyor further includes a third redirecting wheel and a first pressure piece, the third redirecting wheel is arranged on the chain located below the second turning section, and the first pressure piece is arranged on the chain located above the second turning section; the scraper conveyor further includes a fourth observation window, and the fourth observation window faces the second turning section.

[0017] In some embodiments of the present invention, the chain includes a first transition section close to the drive sprocket, and the scraper conveyor also includes a second pressure piece, which is arranged above the chain above the first transition section or below the chain below the first transition section, and the second pressure piece is constructed so that the distance between the chain above and the chain below the first transition section is less than the diameter of the drive sprocket.

[0018] In some embodiments of the present invention, the chain includes a second transition section close to the tensioning sprocket, and the scraper conveyor also includes a third pressure piece, which is arranged above the chain located above the second transition section or below the chain located below the second transition section, and the third pressure piece is constructed so that the distance between the chain located above and the chain located below the second transition section is less than the diameter of the tensioning sprocket.

[0019] In some embodiments of the present invention, the scraper includes a trough body and a wear-resistant plate, the opening of the trough body faces the moving direction of the chain, the first end of the trough body is connected to the chain, and the second end of the trough body is connected to the wear-resistant plate.

[0020] In some embodiments of the present invention, the scraper conveyor further comprises a chute and a liner, the chain is located in the chute, and the liner is attached to the chute wall of the chute.

[0021] In some embodiments of the present invention, the scraper conveyor further includes an alarm, and the alarm is connected to the driving device or the supporting device.

[0022] In some embodiments of the present invention, there are multiple scrapers, and the multiple scrapers are evenly distributed on the chain.

[0023] In some embodiments of the present invention, each end of the scraper is connected to a chain, and there are two driving sprockets and two tensioning sprockets respectively, which cooperate with the chains in a one-to-one correspondence.

[0024] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0025] The scraper conveyor of the present invention utilizes a tensioning device to adjust the position of the tensioning sprocket, so that the chain is kept tensioned between the tensioning sprocket and the driving sprocket, avoiding the chain from being too tight or too loose, reducing failures such as chain breakage and chain falling off, and at the same time utilizing a chain break protector to detect the rotation speed of the tensioning sprocket. Since the tensioning sprocket is a driven sprocket, a reduction or stop in the rotation speed of the tensioning sprocket indicates failures such as chain breakage and chain falling off, and a change in the rotation speed of the tensioning sprocket indicates that the chain is too loose, etc., which facilitates the operator to stop the machine for maintenance in time or adjust the position of the tensioning sprocket in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of an embodiment of the scraper conveyor of the present utility model.

[0027] Figure 2 yes Figure 1 Schematic diagram of the structure of the AA section.

[0028] Figure 3 yes Figure 1 Schematic diagram of the structure of the BB section.

[0029] Figure 4 yes Figure 1 Schematic diagram of the structure of the CC section.

[0030] Figure 5 It is a structural diagram of the driving device in the embodiment of the scraper conveyor of the present utility model.

[0031] Figure 6 It is a structural schematic diagram of the driving device in the embodiment of the scraper conveyor of the present utility model from another perspective.

[0032] Figure 7 It is a structural schematic diagram of the tightening device in an embodiment of the scraper conveyor of the present utility model.

[0033] Figure 8 It is a structural schematic diagram of the tightening device in the scraper conveyor embodiment of the present invention from another perspective.

[0034] Figure 9 It is a structural schematic diagram of the scraper chain group in the embodiment of the scraper conveyor of the present utility model.

[0035] Figure 10 It is a structural schematic diagram of the scraper chain group in the embodiment of the scraper conveyor of the present invention from another perspective.

[0036] In the figure, 100-driving device, 110-motor, 111-driving wheel, 112-driven wheel, 113-transmission chain, 120-driving sprocket, 130-second housing, 140-second rotating shaft, 141-second bearing, 142-sealing assembly, 150-second observation window, 200-tightening device, 210-tightening sprocket, 211-first bearing, 212-first rotating shaft, 220-tensioning device, 221-screw, 222-rotating head, 230-chain break protector, 240-first housing, 250-guide rail, 260-support Support seat, 270-first observation window, 300-scraper chain group, 310-chain, 320-scraper, 321-trough body, 322-wear-resistant plate 330-first horizontal section, 340-vertical section, 350-second horizontal section, 360-first turning section, 361-first redirecting wheel, 362-second redirecting wheel, 370-second turning section, 371-third redirecting wheel, 372-first pressure piece, 380-first transition section, 381-second pressure piece, 390-second transition section, 391-third pressure piece, 400-chute, 410-liner.

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods. DETAILED DESCRIPTION

[0038] like Figures 1 to 10 As shown, an embodiment of the present invention provides a new type of scraper conveyor that can be matched with a deep dehydrator and can efficiently and continuously convey bulk materials such as dust, small particles and small blocks. The scraper conveyor of this embodiment has a solid structure and can withstand external forces such as impact, collision, smashing and pressure of large blocks of materials. The fuselage can be shorter, easy to install, small in space and easy to maintain. Of course, the scraper conveyor of this embodiment can also be used in other scenarios in the field of resource and environmental technology and other fields, and can also be used to transport other types of materials.

[0039] Specifically, the scraper conveyor of this embodiment mainly includes a driving device 100 , a tightening device 200 and a scraper chain group 300 .

[0040] The drive device 100 includes a motor 110 and a drive sprocket 120 driven by the motor 110. When the motor 110 is started, the drive sprocket 120 can be driven to rotate. The tensioning device 200 includes a tensioning sprocket 210, a tensioning device 220, and a chain break protector 230. The scraper chain assembly 300 includes a chain 310 and a scraper 320 disposed on the chain 310. The chain 310 is arranged around the drive sprocket 120 and the tensioning sprocket 210. The drive sprocket 120 and the tensioning sprocket 210 support the chain 310 so that the chain 310 can circulate between the drive sprocket 120 and the tensioning sprocket 210. The tensioning device 220 is connected to the tensioning sprocket 210 and can move the tensioning sprocket 210 along the extension direction of the chain 310, thereby controlling the tension of the chain 310 between the drive sprocket 120 and the tensioning sprocket 210. The chain protector 230 is disposed on one side of the tensioning sprocket 210 and is used to detect the rotational speed of the tensioning sprocket 210. The chain protector 230 can be a conventional rotational speed sensor that converts the rotational speed into a signal, such as an electrical signal, and outputs it. The chain protector 230 can detect the rotational speed of the tensioning sprocket 210 directly or indirectly by detecting the rotational speed of a shaft connected to the tensioning sprocket 210 and rotating synchronously with it.

[0041] The operating principle of the scraper conveyor of this embodiment is as follows: a scraper 320 is fixed to a chain 310 to form a scraper chain assembly 300, which serves as a traction member. When the motor 110 in the drive device 100 is started, the drive sprocket 120 rotates, driving the chain 310 to move, causing the scraper chain assembly 300 to circulate and move the material, completing the material conveyance. At the same time, a tensioning sprocket 210 at the other end of the chain 310 supports the chain 310 and provides steering, and the tensioning sprocket 210 rotates under the drive of the chain 310.

[0042] In this embodiment, the tension of the scraper chain assembly 300 can be adjusted by adjusting the tensioning device 220. When the scraper conveyor is operating normally, the drive sprocket 120 drives the tensioning sprocket 210 to rotate together, and the tensioning shaft maintains a certain speed. When a fault such as chain breakage, belt breakage, slippage, or underspeed occurs, the speed of the tensioning sprocket 210 drops significantly or even reaches zero. The chain break protector 230 monitors the speed of the tensioning sprocket 210. When the speed of the tensioning sprocket 210 falls below a set value, the chain break protector 230 activates and outputs a signal, which can be used to stop the motor 110, thereby protecting the equipment. An audible and visual alarm can also be controlled to prompt the operator to correct the fault.

[0043] In some examples, the tightening device 200 also includes a first shell 240, a guide rail 250, a support seat 260, a first bearing 211 and a first rotating shaft 212. The guide rail 250 is arranged on the first shell 240, the support seat 260 can be movably arranged on the guide rail 250 along the guide rail 250, the first bearing 211 is arranged on the support seat 260, the tightening sprocket 210 is circumferentially linked to the first rotating shaft 212, and the first rotating shaft 212 is connected to the first bearing 211, so that the tightening sprocket 210 can move along the guide rail 250 on the first shell 240, and the guide rail 250 plays a limiting role. At the same time, the tightening sprocket 210 can rotate smoothly on the first shell 240.

[0044] In some examples, the tensioning device 220 includes a screw 221 and a rotating head 222 disposed at one end of the screw 221. The rotating head 222 is disposed outside the housing and is configured to receive an operator's movements to control the tensioning device 220. The distal end of the screw 221 is rotatably connected to the support base 260, and the screw 221 is threadably engaged with the first housing 240, such as a nut fixed to the first housing 240. By rotating the rotating head 222 to rotate the screw 221, the relative position between the distal end of the screw 221 and the first housing 240 can be changed, thereby causing the support base 260 to move toward or away from the connection between the first housing 240 and the screw 221. In other examples, the end of the screw 221 is threadedly engaged with the support base 260, and the screw 221 is rotatably connected to the first housing 240. By rotating the rotating head 222 to rotate the screw 221, the relative position between the end of the screw 221 and the support base 260 can be changed, thereby causing the support base 260 to move closer to or away from the connection between the first housing 240 and the screw 221. The above structure can achieve a tensioning function.

[0045] In some examples, the chain break protector 230 is connected to the support base 260 , and the chain break protector 230 moves with the support base 260 , that is, moves with the tensioning sprocket 210 , and the chain break protector 230 remains located on one side of the tensioning sprocket 210 .

[0046] In some examples, the tensioning device 200 further includes a first observation window 270 . The first observation window 270 is disposed on the first housing 240 . The first observation window 270 faces the tensioning sprocket 210 , making it easier to observe the condition of the tensioning sprocket 210 .

[0047] In some examples, the drive device 100 includes a second housing 130, a driving pulley 111, a driven pulley 112, a transmission chain 113, a second rotating shaft 140, a second bearing 141, and a sealing assembly 142. The second bearing 141 is disposed in the second housing 130, the second rotating shaft 140 is connected to the second bearing 141, the drive sprocket 120 is connected to the second rotating shaft 140 and is located within the second housing 130, thereby enabling the drive sprocket 120 to rotate within the second housing 130. The driven pulley 112 is connected to the second rotating shaft 140 and is located outside the second housing 130. The sealing assembly 142 is disposed between the second housing 130 and the second rotating shaft 140 to achieve a seal and prevent material from entering the motor 110. The motor 110 is located outside the housing and connected to the housing. The motor 110 is connected to the driving pulley 111, and the transmission chain 113 is disposed on the driving pulley 111 and the driven pulley 112 to achieve power transmission. The motor 110, the driving wheel 111, the driven wheel 112 and the driving section of the transmission chain 113 are arranged on the outside of the second housing 130 and can be covered with another detachable housing to facilitate installation and maintenance operations.

[0048] In some examples, the motor 110 is a variable frequency reducer, which can change the speed of the drive sprocket 120 according to process requirements, such as the requirements of the material being transported, thereby changing the speed of the scraper chain assembly 300 and ultimately changing the conveying capacity of the scraper conveyor.

[0049] In some examples, the motor 110 is located above the second housing 130 to reduce the footprint of the driving device 100 .

[0050] In some examples, the sealing assembly 142 is disposed between the driving sprocket 120 and the second bearing 141 to prevent material from affecting the operation of the second bearing 141 .

[0051] In some examples, the driving device 100 further includes a second observation window 150 . The second observation window 150 is disposed on the second housing 130 . The second observation window 150 faces the driving sprocket 120 , making it easier to observe the condition of the driving sprocket 120 .

[0052] In some examples, the chain 310 includes a first horizontal section 330, a vertical section 340, and a second horizontal section 350 connected in sequence between the drive sprocket 120 and the tensioning sprocket 210 in its extension direction, the second horizontal section 350 is higher than the first horizontal section 330, and one of the first horizontal section 330 and the second horizontal section 350 is provided with a feed port and the other is provided with a discharge port, so that the scraper conveyor can transport materials horizontally, inclined, and vertically.

[0053] In some examples, the chain 310 further includes a first bend section 360 between the second horizontal section 350 and the vertical section 340. The scraper conveyor further includes a first bend wheel 361 and a second bend wheel 362. The first bend wheel 361 is disposed below the chain 310 above the first bend section 360, and the second bend wheel 362 is disposed below the chain 310 below the first bend section 360. The first bend wheel 361 and the second bend wheel 362 are used to change the direction of the chain 310. Under the action of gravity, the chain 310 engages with the first bend wheel 361 and the second bend wheel 362. The scraper conveyor further includes a third observation window facing the first bend section 360 to facilitate observation of the first bend section 360.

[0054] In some examples, the scraper conveyor further includes a third redirecting wheel 371 and a first pressure member 372 in the second turning section 370 between the first horizontal section 330 and the vertical section 340. The third redirecting wheel 371 is disposed on the chain 310 located below the second turning section 370, and the first pressure member 372 is disposed on the chain 310 located above the second turning section 370, thereby causing the chain 310 to reverse upward. The scraper conveyor further includes a fourth observation window facing the second turning section 370, which facilitates observation of the second turning section 370.

[0055] In some examples, the chain 310 includes a first transition section 380 close to the drive sprocket 120, and the scraper conveyor also includes a second pressure piece 381, which is arranged above the chain 310 located above the first transition section 380 or below the chain 310 located below the first transition section 380. The second pressure piece 381 is constructed so that the distance between the chain 310 located above and the chain 310 located below the first transition section 380 is smaller than the diameter of the drive sprocket 120. For example, the second pressure piece 381 can be arranged above or below the chain 310 so that the chains 310 are close to each other to save space.

[0056] In some examples, the chain 310 includes a second transition section 390 near the tensioning sprocket 210, and the scraper conveyor also includes a third pressure piece 391, which is arranged above the chain 310 located above the second transition section 390 or below the chain 310 located below the second transition section 390. The third pressure piece 391 is constructed so that the distance between the chain 310 located above and the chain 310 located below of the second transition section 390 is smaller than the diameter of the tensioning sprocket 210 to save space.

[0057] In some examples, the scraper 320 includes a trough 321 and a wear plate 322. The opening of the trough 321 faces the direction of movement of the chain 310. The trough 321 can be used to carry material, thereby improving material conveying capacity. The first end of the trough 321 is connected to the chain 310, for example, by a pivot connection. The second end of the trough 321 is connected to the wear plate 322. The trough 321 and the wear plate 322 can be connected by threaded fasteners. The wear plate 322 is used to improve the wear resistance of the second end of the trough 321.

[0058] In some examples, the scraper conveyor further includes a chute 400 and a liner 410. The chain 310 is located within the chute 400, which serves as a support for various materials. The liner 410 is attached to the wall of the chute 400 to prevent scratches. The wear-resistant plate 322 and the liner 410 can be made of, for example, high-molecular polyethylene material, which increases wear resistance and reduces noise generated during operation of the scraper conveyor.

[0059] In some examples, a cover is further provided on the chute 400 , and the chute 400 and the cover cooperate to form a sealed casing, which can prevent dust from flying and polluting the environment when conveying materials.

[0060] In some examples, the chain 310 may be a roller chain, which moves smoothly and cooperates well with the sprockets.

[0061] In some examples, the scraper conveyor further includes an alarm, which is connected to the driving device 100 or the tensioning device 200. The alarm is used to output an alarm signal such as sound and light based on the chain break protector 230 detecting a decrease in rotation speed.

[0062] In some examples, there are multiple scrapers 320 , and the multiple scrapers 320 are evenly distributed on the chain 310 to improve the material conveying capacity.

[0063] In some examples, a chain 310 is connected to each end of the scraper 320, and there are two drive sprockets 120 and two tension sprockets 210, which are matched one-to-one with the chains 310. Using a double row of chains 310 can better ensure the smooth operation of the scraper 320 in the tank 321.

[0064] Finally, it should be emphasized that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A scraper conveyor, characterized in that It includes a driving device, a tensioning device and a scraper chain group, the driving device includes a motor and a driving sprocket driven by the motor, the tensioning device includes a tensioning sprocket, a tensioning device and a chain break protector, the scraper chain group includes a chain and a scraper arranged on the chain, the chain is arranged around the driving sprocket and the tensioning sprocket, the tensioning device is connected to the tensioning sprocket and can make the tensioning sprocket move along the extension direction of the chain, and the chain break protector is arranged on one side of the tensioning sprocket and is used to detect the rotation speed of the tensioning sprocket.

2. A scraper conveyor according to claim 1, characterized in that The tensioning device further includes a first housing, a guide rail, a support seat, a first bearing, and a first rotating shaft, wherein the guide rail is provided on the first housing, the support seat is movably provided on the guide rail along the guide rail, the first bearing is provided on the support seat, the tensioning sprocket is circumferentially linked to the first rotating shaft, and the first rotating shaft is connected to the first bearing; The tensioning device includes a screw and a rotating head provided at one end of the screw, wherein the rotating head is provided on the outside of the housing; the end of the screw is rotatably connected to the support seat and the screw is threadedly engaged with the first housing, or the end of the screw is threadedly engaged with the support seat and the screw is rotatably connected to the first housing; The chain break protector is connected to the support seat.

3. A scraper conveyor according to claim 2, characterized in that The tensioning device further includes a first observation window, which is provided on the first shell and faces the tensioning sprocket.

4. A scraper conveyor according to any one of claims 1 to 3, characterized in that The driving device includes a second housing, a driving wheel, a driven wheel, a transmission chain, a second rotating shaft, a second bearing and a sealing assembly. The second bearing is arranged in the second housing, the second rotating shaft is connected to the second bearing, the driving sprocket is connected to the second rotating shaft and is located in the second housing, the driven wheel is connected to the second rotating shaft and is located outside the second housing, and the sealing assembly is arranged between the second housing and the second rotating shaft; the motor is located outside the second housing and connected to the second housing, the motor is connected to the driving wheel, and the transmission chain is arranged on the driving wheel and the driven wheel.

5. A scraper conveyor according to claim 4, characterized in that The motor is a variable frequency reducer; The motor is located above the second housing; The sealing assembly is provided between the drive sprocket and the second bearing; The driving device further includes a second observation window, which is provided on the second shell and faces the driving sprocket.

6. A scraper conveyor according to any one of claims 1 to 3, characterized in that The chain includes a first horizontal section, a vertical section, and a second horizontal section connected in sequence between the driving sprocket and the tensioning sprocket in its extension direction, the second horizontal section is higher than the first horizontal section, and one of the first horizontal section and the second horizontal section is provided with a feed port and the other is provided with a discharge port.

7. A scraper conveyor according to claim 6, characterized in that The chain further includes a first turning section between the second horizontal section and the vertical section, the scraper conveyor further includes a first redirecting wheel and a second redirecting wheel, the first redirecting wheel being disposed below the chain above the first turning section, and the second redirecting wheel being disposed below the chain below the first turning section; the scraper conveyor further includes a third observation window, the third observation window facing the first turning section; In the second turning section between the first horizontal section and the vertical section, the scraper conveyor further includes a third redirecting wheel and a first pressure piece, the third redirecting wheel is arranged on the chain located below the second turning section, and the first pressure piece is arranged on the chain located above the second turning section; the scraper conveyor further includes a fourth observation window, and the fourth observation window faces the second turning section.

8. A scraper conveyor according to any one of claims 1 to 3, characterized in that The chain includes a first transition section near the drive sprocket, and the scraper conveyor further includes a second pressing member, the second pressing member being provided above the chain located above the first transition section or below the chain located below the first transition section, the second pressing member being configured such that a distance between the chain located above and the chain located below the first transition section is smaller than a diameter of the drive sprocket; The chain includes a second transition section close to the tensioning sprocket, and the scraper conveyor also includes a third pressure piece, which is arranged above the chain located above the second transition section or below the chain located below the second transition section, and the third pressure piece is constructed so that the distance between the chain located above and the chain located below the second transition section is less than the diameter of the tensioning sprocket.

9. A scraper conveyor according to any one of claims 1 to 3, characterized in that The scraper includes a trough body and a wear-resistant plate, the opening of the trough body faces the moving direction of the chain, the first end of the trough body is connected to the chain, and the second end of the trough body is connected to the wear-resistant plate; The scraper conveyor further comprises a chute and a lining plate, the chain is located in the chute, and the lining plate is attached to the chute wall of the chute.

10. A scraper conveyor according to any one of claims 1 to 3, characterized in that The scraper conveyor further includes an alarm, which is connected to the driving device or the tightening device; There are multiple scrapers, and the multiple scrapers are evenly distributed on the chain; The two ends of the scraper are respectively connected to a chain, and there are two driving sprockets and two tensioning sprockets respectively, which are matched with the chains in a one-to-one correspondence.

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